Abstract
As a light-weight and ultra-thin artificial material, acoustic metamaterial have more different attributes than natural material. The study of sound insulation for acoustic metamaterial is hot, and the membrane-type acoustic metamaterials supplement the deficiency of linear sound insulation materials. The physical material parameters (young modulus and loss factors)of base material of membrane-type acoustic metamaterials (PVC) is obtained by cantilever beam dynamic measurement method. The acoustic metamaterial sound insulation analysis is simulated by CAE method based on the material parameters that measured. The configuration of the simulation accuracy is measured on impedance tube, and the design work of the acoustic metamaterial sound insulation for transformer is provided. The relationship between sound insulation and the mass on membrane-type acoustic metamaterial at the different frequencies (100Hz to 500Hz) provides the reference to set sound insulation frequency.
Highlights
Metamaterial has become a hot research topic in international academic circles in recent years
From the research progress of acoustic metamaterials [5,6,7,8], we find that the focus of research on acoustic metamaterials is the effective parameters of materials, and the parameters directly affect the sound insulation effect [9,10,11,12]
We mainly study the sound insulation characteristics of thin-film acoustic metamaterial composed of rigid frame, flexible film and additional mass
Summary
Metamaterial has become a hot research topic in international academic circles in recent years. Thin-film acoustic metamaterial is a kind of light low-frequency sound insulation material, which was proposed by Hong Kong University of Science and Technology [3] They fixed the elastic thin film with additional mass on a relatively hard support frame to realize effective sound insulation around any specific frequency in the frequency range of 50~1000Hz. In 2010, Naify et al studied the influence of additional weight mass and film tension on the sound insulation range of thin-film acoustic metamaterial by impedance tube test and finite element simulation, and carried out a series of dynamic analysis on the resonance frequency and film vibration at the peak of sound insulation using laser vibration testing instruments [4]. The validity of the simulation results is verified by standing wave tube experiments
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